Lubricating device



May'l, 1 934. A. c. DANVER Er AL LUBRICATING DEVICE Filed July 6. 197514 2 Sheets-Sheet l My l, 1934- A. C. DANVER ET AL 1,956,640

LUBRICATING DEVICE Patented May 1.,. 1334 l ViJuiTi-:D STATES PATENT' oFFicE LUBRICATNG DEVICE AndrewJC. Danvcr and Samuel R. Danver, Pawtucket, R. I.

Application July 6,1931, serial No. 548,808 v 20 claims. (ci. 12s- 196i 'Ihis invention relates to apparatus for hanmanifold 11 of allyeonvelltiorlal form 0f indling fluids, and morel particularly to a device tetjnal combustion vmotor or engine. The appa.- for suppiying liquid lubricant to internal comratus is adapted to be mounted upon the Side bustion motors or engines. of the motor cylinder block, the dash of an au- One object of the invention is to provide a tomobile or any other suitable support, by means 60 device for lubricating internal combustion enof a bracket 12 having a horizontal Shelf llorgines which is operative when the engine is at tion 13 which may constitute' the top or cover rest to segregate a measured quantity of lubrof the reservoir 10. The reservoir procant for lubricating the motor in starting; and vided with a horizontal circular bottom-plate 14 normally to continuously provide theproper corresponding t0 the top-plate 13. Held between 65 amount of' lubricant when the engine is run- JIlle toll-plate 13 and bottom-Plate 14 iS a Cylinning. drical casing or shell 20, preferably of glass,

Another object of the invention is to provide a .which formsy the main reservoir chamber. The device for lubricating internal combustion en- VeIldS 0f the Cylinder 20 are tted to grooves 15 15 gines which will be continuously operative wlthand 16 in the Plates 13- and' 14, With 'annular 70 out adjustment to store lubricant when the envgaskets 17 and 18 positionedn the grooves to gine is at rest and to supply the lubricant at provide airand huid-tight joints. The cylinder various rates of now in accordance with the speed 20 iS. clamped in Place between the plates 13` of the engine when running, and 14 by means-of bolts 21 passing therebe- Another object, of the invention is to provide tween. Eachbolt isprovided with a slotted head 75' a device of the type'specifled which will not alter 22 and a washer 23 thereunder at one end. the

or aiect the proper carburetion ofthe fuel. other end being externally threaded at 24- The Another object of the invention is to provide bolts 21 are passed through vertically alined a. device ofthe type speciaed for introducing a aperturesiland 26 in the upper and lower plates heat-resisting and ydecarbonizing lubricant di- 13 and 14 of the reservoir, the ya'lleltlll'es 26 irl 80 rectly into the cylinders of an internal combuslthe bottom-Plate being internally threaded to tion engine whereby, in addition to lubricating receive the threaded extremities of the bolts.

the bearings, itwilldecompose the carbon formed The top-plate 13 is provided with an axial by previous combustion and deposited. on the threaded aperture 27 forllSe in llllg' the reS- 30 pistons and other parts. ervoir, the aperture being normally closed by a 85 Another object of the invention is to provide threaded cap 28 which iS Provided With a breatha device of the type specied which is simple Aer hole 2 9,^see Fic. -3. Forward ofthe central and compact in construction and reliable aud- Vaperture 27 .a threaded aperture 30 s'formed in efcient in operation. the top-plate 13 and axially alined therewith'is a Further objects of the invention are set forth threaded aperture 3l in the bottom-plate 14. An 9o in the following specification which describes a outlet plug 32 provided-with a reduced externally preferred form of constructionof the invention, threaded portion 33 is screwed into the threaded by way of example, as illustrated in the accom aperture 3l in the bottom-plate 14 to be tightlypanying drawings. In the drawings: seated therein. i)

Fig. l is a. side elevation of the device shown i An axial passage 34 is formed in the' plug 32, 95

40 as connected to the intake manifold of an internal the opening being reduced in diameter at its combustion engine; lower portion and formed with a beveled seat 35. Fig. 2 is anjend elevation oi' the device as viewed Above the bottom-plate 14 the outlet plug 32 isA from the left in Fig. 1; provided with four radially-extending ducts 36 Fig. 3 is a plan view of the same; communicating with the axial passage 34 where- 100 Fig. 4 is a vertical sectional view of the deby the huid in the reservoir 10 may pass through vice taken on line 4-4 of Fig. 3; A the radial ducts 36 into the axial aperture 34 and Fig. 5 is a horizontal sectional view of the downwardly through thebeveled seat 35. y same taken on 1ine.55 of Fig. 4; and To control the rateof ilow of 'the liquid from Fig. 6 is a bottom plan view of the device. the reservoir l0 a needle-valve is providedcom- 105 Referring to the drawings, wherein like parts prising a rod 37 which is adjustable longitudinallyl are indicated by the same reference numerals, vof the opening in the plug 32 by means-o1.' a a lubricating system constituting one embodiscrew engagement with internal threads 38 inthe l fuient 'of the invention includes a' lubricant resplug. The lower portion of the rod 37 is reduced ervoir 10 which may be connected to the intake in diameter to form 'the needle 41 which is pro- 110 vided with a pointed lower extremity 42 adapted to t the beveled seat 35 to tightly close the outlet from the reservoir. An axially bored bushing 44 is threaded into the aperture 30 in the topplate 13 to provide a bearing for the needle-rod 37. A fluted knob 45 is formed on or secured in any suitable manner to the upper end of the rod 37 to provide a convenient means for adjusting the needle-valve. The bushing 44 is provided with an intermediate annular shoulder 46 against which is seated the apertured end of a detentmember 47. The detent-member 47 is provided with an upwardly extending spring-arm 48 formed at its extremity with a projection 49 adapted tc engage the uted periphery of the knob 45. Above the shoulder 46 the bushing 44 is formed with a 'threadedv extremity 50 upon which is received an interiorly threaded thimble 51. Within the thimble 51 is a suitable packing 52 which is compressed around the rodh37 to form a fluidand air-tight gland, see Fig. 4. The thimble 51 also serves as the means for securing lthe detent-member 47 in position and against turning on the bushing 44. It will be understood that the arm 48 is resilient to permit the knob 45 to be manually turned to adjust the needle-valve to vary the size of the outlet at the bottom of the reservoir whereby to control the rate of 110W of the lubricant therefrom.

For the purpose of cleaning thelubricant ilowing from the reservoir, the plug 32 is enclosed above the bottom-plate 14 with a strainer and :lilter 53 which may comprise an annularlyshaped strip of felt or any other suitable porous material. The felt strip 53 is held in position surrounding the plug 32 by means of a cylindrical Wire screen 54 which encloses it, the screen being soldered or otherwise secured to a ring 56.

`The ring 56 is held in place by a peripheral shoulder 56 on the outlet plug 32. This construction permits removal of the strainer for cleaning or renewal of the felt by removing the plug.

An annular groove or recessY 58 is formed in the under surface 'ofthe bottom-plate 14, co-axial with the aperture 31, te accommodate an annular gasket 59 of leather, cork or the equivalent which provides a seat for a small'cylinder 61, preferably constructed of glass. The glass cylinder 61 constitutes a transparent wall for an atomizing and measuring chamber, being held in place against the underside of the reservoir 10 by means of a bottom-plate 62 of generally circular shape. A pair of apertured ears 63 project from the rimv of the bottom-plate 62, and inserted therethrough are screws 64 threaded into holes in the bottom-plate 14 of the main reservoir. The upper face ,of the plate 62 is formed with an annular groove 68 in which is positioned a gasket 69 of leather, cork or the like 'for sealing the joint at the lower edge of the glass cylinder 61.

The purpose of the measuring chamber 61 is to provide for normally atomizing the lubricant and also to segregate a quantity of lubricating iluid from 'the reservoir 10 to be supplied when the engine is first started. The measured quantity of lubricant is suflicient to permit immediate and easy starting of the engine even though the latter has been idle long enough to cause the customary oil supply in the crank-case to become chilled and the walls of the cylinders' and rings to have been drained of the coating of oil essential to their best operation. o

A V-shaped or double-branched projection 71 is formed on the bottom ofthe plate 62, the left- ?f hand arm thereof, as viewed in Figs. 1, 4 and 6,

being provided with a horizontal opening 72 extending therethrough and the right arm with a similar passage 73. A tube 74 has its end secured `in the outer orice of the opening 72 and curves downwardly and upwardly therefrom in a gooseneck formed at its extremity with an annular shoulder 76. An interiorly threaded thimble 77 is carried at the end of the tube 74 engaging the shoulder 76 whereby the tube may be connected with an externally threaded coupling 78. The coupling 78 is internally threaded at 79 and secured to the reservoir 10 by engagement of its external threads with a threaded aperture 81 in 'the bottom-plate 14. The top-plate 13 is provided with an aperture 82 alined with the aperture 8l of the bottom-plate 14 and a tube 83 extends downwardly therefrom through the main reservoir. each end with its lower end screwed into the internally threaded portion 79 of the coupling 78.`

The tube 83 is externally threaded at l The upper threaded end 85 of the tube 83 projects above the top-plate 13 to receive a nut or collar 86 screwed down against the top-plate 13.

The uppermost extremity of the tube 83 has a screwthreaded connection with a valve-chamber or housing 88 to be next described. A laterally extending recess 89 is formed in the valve-housing 88 with an externally threaded coupling 90 threaded into its open end, see Fig. 3. An annularly shouldered tube 93 communicating with the axial opening 91 of the coupling 90 is connected to the coupling by means of an interiorly threaded apertured thimble 94. The tube 93 constitutes a suction feed pipe for the apparatus, being connected to the interior of the intake manifold by coupling 92 and hexagonal thimble 95. The valve-housing 88 is formed with a longitudinally extending passage 96 providing communication between the `vertical bore 87 thereof and the lateral passage 89. The passage 96 is formed with a tapered seat 97 where it opens into the bore 87 communicating with the tube 83. Projecting from the end of the valve-housing 88 is 4an internally and externally threaded neck 98 disposed co-axial with the passage 96. Engaging the threaded bore of the neck 98 is a. valve-stem 99 formed at its inner end `.with a reduced extension 100. The extremity of the extension 100 of the stem 99 is formed with a needle point 101 adapted to t the tapered seat 97 to close the lopening into the passage 89.

A uted knob 102 on the outer extremity of the valve-stem 99 provides means for manually adjusting the valve. A detent-member 103 has an -108 in its interior which is compressed around the valve-stem 99 to provide a leak-proof gland for the valve. It will be understood that the spring arm 104 is resilient to permit the knob 102 to be readily turned to causethe needle valve4 tobe advanced or retracted with respect to the tapered `seat 97 of the passage 96 whereby to adjust the size of the opening therethrough.

A tube 109, similar to the tube 74, is securedv in 'the orifice of the opening 73 of the right-hand arm of the branched projection 71 on the bottomplate 62 of the measuring chamber 61. The'bopposite flanged end of'the tube 109 is held in an interiorly threaded thimble 112 screwed onto a coupling 113 which is threaded through the bottom-plate 14 of the main reservoir 10. Screwed into the threaded bore of the coupling 113 is a vertically extending tube 118 which passes up through the interior of the reservoir and through an opening 122 in its top-plate 13. The upper end of the tube 118 projects above the topplate 13, and has threaded thereon an axially apertured cap 123.. rI'he cap 123 is provided with a plurality of radial air-ducts 124 communicating with the atmosphere. The cap 123 is formed with a circumferential recess 126 in which is soldered or otherwise suitably secured a fine mesh ing and measuring chamber 61 through the tubes o screen 127.

The inner end of the tube V109 secured in the opening 73 of the branched projection 71 communicates with a verticaltube or standpipe .128 held in anopening in the top of the bottomplate 62 of the atomizing and measuring chamber 61. The upper end of the standpipe 128 opens into the chamber 61 just below the bottom of the main reservoir 10.

From the foregoing description of the apparatus it will be observed that when 'the device is assembled various conduits are established, one of which, for the lubricant, leads in the following manner:` From the interior of the reservoir 10 through the wire strainer 54, felt filter 53 and the radial apertures 36 of the plug 32 downwardly through the axial passage 34 into the atomizing and measuring chamber or small reservoir 6l. Another conduit for the lubricant,"or for lubricant andv air, extends from the atomiz- 74 and 83 to the alve-housing 88 and thence to the intake manifold 1l by way. of the suction tube 93. An .air conduit, opening to the atmosphere through the radial apertures in the cap 123, extends down through the cap and the tubes 118 and 109 to the standpipe 128 opening into the upper portion of the measuringand atomizing chamber 6l.

The method of operation of the device is as follows: 'Ihe ller cap 28 is removed by unscrew'- 'motor easily when desired.Vv

ing it from the aperture 27 in the top-plate 13 and a supply of lubricant poured into the reser-` voir 10, after which the cap is replaced.

ber 61. By turning the knob 45 the needle point 42 .is advanced or retracted with respect to the valve-seat 35 in the plug 32 to regulate the size of the opening through the' valv'e. Satisfactory results have been obtained for motors of conventional size where the adjustment is such as to permit a ow of one drop of oil per minute from the reservoir 10 into the atomizing and measuring chamber 6l. When themotor is stopped for during the normal functioning of thel motor is The needle-valve 37 at the bottom of the reservoir 10 is 'adjusted to establish the desired rate of iiow tothe atomizving and measuring cham- The oil segregated from the reservoir 10 rst fills the chamber 61 and tube'7-1 to the level of the upper end of the standpipe 128, after which it may ilow into the standpipe and Atube 109 to the same level. The feed may continue until the chamber 61 is completely lled and the oil attains a level in the tubes 83 and 118, equal to that in the reservoir 10. 'I'his condition represents the segregation of a maximum quantity of oil suflicient Ato start the motor underl the most severe atmospheric conditions. It will be evident that the portion .of the segregated charge which is in the tubes 83 and 113 is only a small fraction of the whole, consequently, satisfactory results are obtained even when the major supply in the reservoir 10 is almost exhausted, and the oil in the tubes and the reservoir 10 is at the level of the bottom of the reservoir.

In starting, as the motor makes its initial revolution, the suction created-in the cylinders draws; the oil from the chamber 61 upwardly into tubes 74 and 83 and through the valve-housing 88 andtube 93 tothe intake manifold 11. ',After the lubricant is substantially exhausted from the chamber '61 in starting the motor the atomizing tube 118 comes into play as the oil feedis reduced in volume. The tube 118, being opened to the atmosphere through the strainer at the top, serves as a breather pipe, supplying clean air to the chamber 6l by way of the tube 109 and the standpipe 128. The adjustment of the needlerod 37 in the plug 32, which permits say a flow of one drop of oil per minute when the motor Ais not running, eects a flow of from two to twelve drops. of oil per minute when the motor is functioning due` to a partial vacuum being created in the chamber 61 and thus "a constant supply of lubricant in the proper amount is furnished to the motor cylinders.

.'To regulate the `amount of oil/'fed to the cylinders during the normal running of the motor the needle-valve 99 is adjustedfby means of the .knob 102, this adjustment is best accomplished while the engine is running in accordance with its the sight feed observed through the glass wall ofthe chamber 61.` .A measured iiow of oil is thus continuously supplied to the upper portion of the engine to lubricate the pistons, valve-seats and stems. The oi1feeding from the chamber 61 tons, thus effectually preventing the knocking and clinking caused by pre-ignition. The motor is thus caused to function at maximum capacity over long periods without requiring removal of 135 carbon deposits or regrinding of the valves.

',The device thus operates under all conditions but 9 feW minutes only a Small amount Of'lubl'is 'to measure in the chamber 61 a charge of lubritherefore, that once the valve is properly adjusted the oil will drip continuously from the reservoir 10 into the chamber` 61 whereby. when theN motor is not running, a quantity o! the oil co1- lects, in the chambenwhichquantity, .since itl varies in amount in proportion to the time the motor is idle, is alwaysK suillcient to start the cant when the motor is idle to be supplied to quickly and easily start the motor; and, further,

The capacity of the atomizing and measuring chamber 61 is determined by the size of the engine or motor to which the device is connected, the motors of `passenger cars, for example, requiring a less capacity than truck motors. Measuring chambers of greater or lesser capacity are readily provided by removing the screws 64 and substituting a glass cylinder of the desired length, after which the bolts are replaced and tightened to restore the air-tight assembly of the cylinder 61 and the annular gaskets 59 and 69. This operation is conveniently performed without disturbing the connection of the tubes 74 and 199, the flexibility of the tubes permitting sufficient movement of the bottom-plate 62 to permit changing the cylinders.

The flow capacity of the drip duct or outlet port 34 of the reservoir 10 is adjusted in accordance with the size of the motor, and normally when once the adjustment has been found satis` factory it is unnecessary to modify it, except for atmospheric changes.

When an internal combustion motor or engine is in continuous operation the walls of the cylinders, pistons, rings and valves are constantly splashed with oil thrown upwardly from the crank-case supply. When the motor is stopped the oil returns by gravity to the crank-case, draining from the upper parts of the motor and leaving the cylinder Walls, pistons and valves relatively dry. This condition may evolve to such an extent that the motor is' Very hard to start, the difculty being aggravated by the normal tendency of the\crankcase oil to congeal when the engine remains idle.

Another common difficulty heretofore has been the tendency of the valves and valve-seats to becom e coated and pitted by carbonaceous products of combustion resulting in an ever-present liaf bility to stick.

These problems have been approached in the past by various devices which spray a small quan tity of lubricant through the intake manifold and onto the upper portions of the cylinders from a supply independent of the crank-case. Such devices, however, have usually required adjustment or refilling after each starting operation, necessitating frequent attention under the hood of the car; or have been so connected to the source of supply as to be extremely wasteful of the lubricant after the motor is running. The present device when once adjusted operates automatically, requiring no attention on the part of the operator except to maintain a supply of lubricant in the reservoir. My invention therefore provides a most important improvement in the art to which it relates.

While the device is herein illustrated and described as embodied in a preferred form of construction, it is to be understood that various modications may be made in its structure and arrangement without departing from the spirit or scope of the invention as expressed in the following claims. The device is furthermore susceptible to other applications where it may be advantageously employed and the invention is therefore not limited to a particular use asl herein specified. Therefore, without limiting myself in this respect, I claim:

l. In an apparatusfor supplying fluid such as lubricant, a reservoir, a measuring chamber, a drip-duct connecting the interior of the reservoir with the measuring chamber, and a feed line leading upwardly from the bottom of the chamber, said measuring chamber being adapted vto segregate ,and store a quantity of fluid fed thereto through the drip-duct in an amount commensurate with the duration of time in which the engine remains idle with no suction in the lfeed line.

2. In an'apparatus for supplying fluid such as assenzio lubricant, a reservoir, a measuring chamber beneath the reservoir, a drip-duct leading from the reservoir to the chamber, a feed line leading upwardly from the bottom of the measuring chamber, and a suction line connected to the feed line, said measuring chamber being adapted to segregate and store a quantity of fluid fed thereto from the reservoir in an amount commensurate with the duration of time in which the engine remains idle with the suction line inoperative.

3. In an apparatus for supplying fluid such as lubricant, a reservoir, a measuring chamber, a duct connecting the interior of the reservoir with the chamber, a second duct open to the atmosphere and leading into the chamber, and a suction line connected to thev chamber.

4. In an apparatus for supplying fluids, a reservoir, a measuring and aerating chamber, a duct connecting the interior of the reservoir with the chamber, means for controlling the capacity of the duct to store a quantity of fluid commensurate with the duration of time in which the engine remains idle, an air duct open to the atmosphere and communicating with the top of the chamber,

Vand a suction line leading from the chamber.

5. In an apparatus for supplying fluids. a reser voir, a measuring chamber, a duct at the bottom of the reservoir connecting its interior with the chamber, means for controllingthe `capacity of the duct to feed a measured, quantity ofiluid into the chamber in an amount commensurate with the duration of time in which the engine remains idle, a feed line at the bottom of the chamber, and a valve for connecting the feed line with a suction line.

6. In an apparatus for supplying fluids, a reservoir, a measuring chamber, a duct connecting the interior of the reservoir with the chamber, means to regulate the size of the duetto control the amount of iluid dripped therethrough into the chamber in accordance with the duration of time in which the engine stands idle, an air duct open to the atmosphere and leading into the chamber, a standpipe in the chamber connected to the air duct, and a feed line leading from the chamber.

7. In an apparatus for supplying uids, a reservoir, a chamber, a drip-duct connecting the interior of the reservoir with the chamber, means exterior of the reservoir for controlling the capacity of the drip-duct, a feed line leading from the chamber, anda suction line connected with the feed line.

8. In an apparatus for supplying fluids, a reservoir, a measuring chamber, a, duct connecting the interior of the reservoir with the chamber, a suction line connected to the chamber, means for controlling the capacity of the rst duct, and a valve for controlling the rate of feed through the suction line. y

9. A lubricating Asystem for internal combustion engines comprising a reservoir, a measuring chamber beneath the reservoir, a duct connect'- ing the interior of the reservoir with the chamber, means for adjusting the capacity of the duct, a feed line for connecting the interior of the chamber with the manifold of the engine, and a Valve in the feed line for varying the suctionA effect of the engine.

10. In a lubricating device, a reservoir for' asupply of lubricant, a chamber for segregating a portion of the supply, a duct leading from the reservoir to the chamber, means for controlling the feed through the duct, a feed line at the bottom of the chamber for connection with the suction line, means to adjust the capacity of the vfeed line, and an air intake duct opening into the chamber.

11. In a lubricating device, a reservoir for a supply of lubricant, a measuring chamber, a duct leading from the interior of the reservoirA to the chamber for drip feeding the lubricant thereinto, means for controlling the feed through the duct, and a feed line leading upwardly from the bottom of the chamber for connection with a suction line whereby when no suction occurs in the line a quantity of fluid will drip from the reservoir into the measuring chamber in an amount commensurate with the duration of time in which the motor stands idle. A, I

12. In a lubricating device, a reservoir for a supply of lubricant, a measuring chamber, a duct leading from the interior of the reservoir to the chamber, means in the duct for controlling the feed of the lubricant therethrough, means for connecting the chamber with the intake manifold of a motor, means for regulating the feed from the reservoir tothe chamber, and means for regulating the rate of feed from the chamber.

13. In an apparatus for lubricating internal combustion engines, a measuring chamber, a conduit for connecting the chamber with the intake manifold of the engine, a reservoir for a supply of lubricant, a duct at the bottom of the reservoir communicating with the chamber, a valve for controlling the rate of feed through the duct, means exterior of the reservoir for adjusting the valve, and means for adjusting the rate of feed through the conduit.

14. A lubricating system tion engines including a supply reservoir for lubricant, a measuring chamber, a duct leading from the reservoir tothe chamber, means for controlling the capacity of the duct to effect a drip feed of lubricant into the chamber, a feed line for connecting the chamber with the intake manifold of the engine, and an air intake duct leading into the chamber.

15. In a lubricating system for internal combustion engines, a reservoir for a supply of lubricant, a chamber for segregating a measured quantity of lubricant from the reservoir in an amount commensurate'with the duration of time during which the engine is idle, a suction linel leading from the measuring chamber and adapted to be connected with the engine, and a valve in the suction line for controlling the rate of iiow therethrough.

16. In combination, an oil reservoir comprising a transparent cylinder and topand bottomplates closing the ends thereof, a measuring chamber on the bottom-plate, a drip valve in the for internal combusbottom-plate communicating with the measuring chamber, means on the top-plate for adjusting) the drip valve, and an air duct communicating' with the chamber and open to the atmosphere.

17. In combination, an oil reservoir comprising a glass cylinder and topand bottom-plates closing the ends thereof, a measuring chamber on the bottom-plate, a drip valve in the bottomplate communicating Withthe measuring chamber, means on the top-plate for controlling the drip valve, a feed duct connected With the chamber and leading through the reservoir to the topplate, a valve on the top-plate for controlling the rate of feed from the measuring chamber, and an air duct leading into the chamber through vthe reservoir and open thereabove to the atmosphere.

18. In combination, an oil reservoir comprising a glass cylinder, a top closure detachably secured to one end of the cylinder, a bottom closure detachably secured to the opposite end, a measuring chamber detachably secured on the bottom closure member, a drip-duct opening through the bottom-plate into the chamber, anair inlet duct, an oil feed duct, both ducts communicating with the measuring chamber' and extending through i, of the cylinder, a bottom-plate closing its opposite end, a measuring chamber on the bottomplate, a drip-duct opening through the bottomplate into the chamber, a pair of vertical ducts extending through both topand bottom-plates, one of said ducts open to the air and communieating with the measuring chamber and the other duct leading from the bottom of the measuring chamber, and a valve on the top-plate for controlling the feed through the oil duct.

20. In combination, an oil reservoir comprising a glass cylinder and topand bottom-plates closing the ends thereof, a measuring chamber on the bottom-plate, a drip Valve in the bottomon the top-plate for controlling the drip valve, an air intake duct connected with the chamber and leading through the reservoir, an oil duct connected with the chamber and leading through the reservoir, and means at the top of the reservoir 'for controlling the feed through the oil duct. y

ANDREW C. DANVER.

SAMUEL R. DANVER.

plate communicating with the chamber, means 

